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Acquisition of MediaMission Holding B.V. - Additional Information (Detail) (USD $)
3 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2013
Dec. 16, 2013
Sep. 30, 2014
Jan. 10, 2014
Business Acquisition [Line Items]            
Subordinated note payable issuance for purchase of MediaMission   $ 687,000us-gaap_NotesIssued1        
Common stock issued for purchase of MediaMission   348,000us-gaap_StockIssued1        
Notes payable interest rate           6.50%sofo_NotesPayableInterestRate
Goodwill 10,911,000us-gaap_Goodwill       11,185,000us-gaap_Goodwill  
Contributed revenue 8,741,000us-gaap_Revenues 7,206,000us-gaap_Revenues        
Net income (loss) for acquisition period (1,032,000)us-gaap_NetIncomeLoss (690,000)us-gaap_NetIncomeLoss        
MediaMission Holding B.V. [Member]            
Business Acquisition [Line Items]            
Total purchase price       1,493,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
   
Common stock issued for purchase of MediaMission       348,000us-gaap_StockIssued1
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
   
Business acquisition, cash paid       458,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
   
Business acquisition, number of shares issued       37,608us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
   
Ownership percentage       100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
  100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
Goodwill       932,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
   
Amortization period for customer relationship intangible 10 years          
Contributed revenue 237,000us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
  90,000us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
     
Net income (loss) for acquisition period (123,000)us-gaap_NetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
  43,000us-gaap_NetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
     
MediaMission Holding B.V. [Member] | Income Approach Valuation Technique [Member]            
Business Acquisition [Line Items]            
Fair value assumptions discount rate       28.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
   
Estimated effective tax rate       20.00%sofo_EstimatedEffectiveTaxRate
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
   
Estimated customer attrition rate       15.00%sofo_EstimatedCustomerAttritionRate
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
   
MediaMission Holding B.V. [Member] | Subordinated note payable [Member]            
Business Acquisition [Line Items]            
Subordinated note payable issuance for purchase of MediaMission       $ 687,000us-gaap_NotesIssued1
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Notes payable interest rate       6.50%sofo_NotesPayableInterestRate
/ us-gaap_BusinessAcquisitionAxis
= sofo_MediaMissionMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Subordinated note payable maturity period       3 years